Why air will not blow through front vents? on 2011 Jeep Liberty

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
only blows the air through dash and foot vents.
(2) Answers
Mode selector problem,have BCM scan test performed.
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scan a/c system for codes and post
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